Experimental Features

The x-neynar-experimental header enables filtering capabilities powered by the Neynar score. When enabled, this header provides cleaner data by filtering out follows, likes, recasts, and replies from accounts with scores below a threshold.

By default, this flag is set to false.

Effects When Enabled

Filtering

Followers: Lists and counts are filtered based on Neynar score to exclude low-scoring accounts
Likes, Recasts, and Replies: Lists and counts are filtered to show only interactions from accounts meeting the score threshold
Global API Impact: These filtering effects apply to all API endpoints that return cast objects, user objects, follower lists, or reaction lists when you enable the header

Added data

User Objects: Include Neynar score in the response (update: this score is now included regardless of the flag)
```
"experimental": {
  "neynar_user_score": 0.97
}
```

Conversations

Reply handling uses the existing fold parameter for filtering:

With or without experimental features enabled, when fold=above, replies are filtered by Neynar score
When experimental features are enabled, reply counts for a cast sync with "above the fold" replies

Example 1: Followers

curl --request GET \\
     --url '<https://api.neynar.com/v2/farcaster/followers?fid=3&limit=20>' \\
     --header 'accept: application/json' \\
     --header 'x-api-key: NEYNAR_API_DOCS' \\
     --header 'x-neynar-experimental: true'

This example demonstrates the experimental filtering behavior for follower lists. Without the header, all followers are returned with unfiltered follower counts. When fetching followers with x-neynar-experimental: true, the response filters out accounts based on Neynar score thresholds. Each user object returned includes the Neynar score and filtered follower counts.

Example 2: Conversations

curl --request GET \\
     --url '<https://api.neynar.com/v2/farcaster/cast/conversation?identifier=https%3A%2F%2Fwarpcast.com%2Fdwr.eth%2F0xcdf7d77b&type=url&reply_depth=2&include_chronological_parent_casts=false&sort_type=algorithmic&fold=above&limit=20>' \\
     --header 'accept: application/json' \\
     --header 'x-api-key: NEYNAR_API_DOCS' \\
     --header 'x-neynar-experimental: true'

This example demonstrates the experimental filtering behavior in the conversation response. Without the header, you get raw counts. With the header enabled, you get filtered counts for likes, recasts, and replies on both the main cast and all reply casts. All user objects include their Neynar scores and filtered follower counts. Whether the header is enabled or not, replies are filtered if fold=above .